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Start with the full category, then apply the exact boundary: The three aligned Tharsis Montes volcanoes. Olympus Mons is in the broader Tharsis region but is not one of this trio. You only need one qualifying answer. A longer name is not automatically rarer.
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ArsiaArsia Mons · 70 points · 5 characters
Arsia Mons is the southernmost of the three Tharsis Montes volcanoes.
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Ascraeus Mons85 points · Shortest accepted spelling: Ascraeus
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- Apply the complete question boundary: The three aligned Tharsis Montes volcanoes. Olympus Mons is in the broader Tharsis region but is not one of this trio.
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Why these answers qualify
Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: ESA · Frosty volcanoes discovered in Mars’s tropics ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.